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(No Model.)

N. W. PRATT.

SURFACE BLOW FOR STEAM GENERATORS. No. 323,884. Patented Aug. 4, 1885.

& BMAL MZEL' INVENTOR WITNESSES ATTORNEY N4 PETERS. PhnhrLilbognpher. Washingmn, D.C

UNITED STATES PATENT OFF CE.

NATHANIEL W. PRATT, OF BROOKLYN, ASSIGNOR TO THE BABGOGK & WIL- OOX COMPANY, OF NEW YORK, N. Y.

SURFACE-BLOW FOR. STEAM-GENERATORS.

SPBCIFICAION forming part of Letters Patent No. 323,884, dated August 4, 1885.

Application filed March 27 1885.

To all whom it may concern.-

Be it known that LN ATHANIEL W. PRATT, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement-in Surface-Blow for Steam-Grenerators, of which the following is a specification,reference being had to the accompanying drawings, in Which Figure 1 is a side view, partly in section and Fig. 2 an end view, of a steam-generator illustrating my invention.

The invention consists in arranging a pan or receptacle within the boiler near the surface of the normal water level in a manner to collect the foreign matter or impurities that are thrown to the surface of the water by the application of heat, which are subsequently removed through a connected blow-off pipe from the bottom of said pan, having a discharge cock or valve that may be operated at the will of the attendant, or automatically, by means of a connected safety-valve, all as hereinafter particularly referred to.

In the drawings, a represents the shell of a boiler, partly broken away in Fig. 1 to show a portion ot'its interior, and the arrangement of parts of the invention.

b is a pan or receptacle extending the en- 0 tire width of the boiler, as shown in dotted lines, Fig. 2, open at the top, and placed with its front edge, d, about one inch below the normal water-level of the boiler, and in its rear edge, 0, projecting above said level, substan- 5 tially as shown.

6 represents a blow-oft pipe leading from the bottom of the pan outward, and provided with a valve, f, that may be operated by hand, or by means of a rod-connection, 70, attached (No model.)

to the working-lever of a safety-valve, g, or 40 similar device-for example, a weighted diaphragm.

The pan or receptacle 7) is arranged with its lowest or submerged edge, (1, toward the flow of the water-current, the direction of the 4 5 latter being indicated by the arrows, Fig. 1, and its rear edge, 0, that projects above the water-level, deflects the surface-water into the pan, so that when the valve f is opened, all the surface-water and its contained impurities above the front edge, d, of the pan are drawn off, the valve f being closed when steam is discharged at the end of the pipe 0, which indicates a fall in the water-level to that point.

a In operating the valve f automatically by a 5 connection with the working-leverofthe safetyvalve, as referred to, the valve will be opened whenever the pressure in the boiler reaches the point at which said valve is adjusted to act.

An independent safety-valve, i, may also be provided to regulate the maximum pressure to be carried in the boiler and adjusted to act at a pressure slightly above that at which the valve 9 is adjusted.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

In combination with a surface blow-pan, substantially such as described, a safety-valve adjusted to act at a given pressure and connected to automatically and simultaneously operate the blow-oft valve of said pan, for the purpose set forth.

NAT. W. PRATT.

Witnesses:

U. W. FORBES, AUG. OREVELING. 

